Finding the Fourth Proportional to 21,909.61, 32,854.69 and 13,589.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,909.61 : 32,854.69 = 13,589.29 : x
2. Step 2: Convert to fraction form
   21,909.61/32,854.69 = 13,589.29/x
3. Step 3: Cross multiply
   21,909.61x = 32,854.69 × 13,589.29
4. Step 4: Simplify right side
   21,909.61x = 446,471,910.27
5. Step 5: Solve for x
   x = 446,471,910.27/21,909.61
6. Step 6: Final answer
   x = 20,377.90